Datasheet > KA3844

KA3844

更新时间： 2024-11-23 03:47:19

品牌	Logo	应用领域
伊泰克 - ESTEK		控制器
页数	文件大小	规格书
7页	321K
描述
fixed frequency current mode PWM controller

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中文翻译

获取价格

数据手册

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KA3844 数据手册

Description

The 3842A(AM)/43A(AM)/44A(AM)/45A(AM) are fixed frequency current mode PWM controller. They are specially designed for

OFF−Line and DC to DC converter applications with a minimal external components. Internally implemented circuits include a trimmed

oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier, current sensing comparator,

and a high current totempole output ideally suited for driving a power MOSFET. Protection circuitry includes built undervoltage lockout

and current limiting. The 3842A(AM) and 3844A(AM) have UVLO thresholds of 16 V (on) and 10 V (off). The corresponding

thresholds for the 3843A(AM)/45A(AM) are 8.4V (on) and 7.6V (off). The MIK3842A(AM) and MIK3843A(AM) can operate within 100% duty

cycle. The 3844A(AM) and UC3845A(AM) can operate within 50% duty cycle.

The 384XA(AM) has Start-Up Current 0.17mA (typ).

Features

Pin Connection

•

Low Start-Up and Operating Current

High Current Totem Pole Output

Undervoltage Lockout With Hysteresis

Operating Frequency Up To 300KHz (384XA)

500KHz (384XAM

)

Top view

Block diagram

(toggle flip flop used only in MIK3844, MIK3845)

36V

GND

SET

REF

UVLO

GOOD

LOGI

RNAL

BIAS

POWER

1/2 V

REF

COM

LA CH

CUR

RENT

SEN

OSCILLATOR

Absolute Maximum Ratings

Symbol

Parameter

Maximum

Units

V_CC

I_O

Supply Voltage (low impedance source)

±1

Output Current

V_I

I_{SINK (E.A)}

Input Voltage (Analog Inputs pins 2,3)

Error Amp Output Sink Current

Power Dissipation (T_A=25⁰C)

Storage Temperature Range

−

0.3 to 5.5

Tstg

-65 to150

260

^oC

T_L

Lead Temperature (soldering 5 sec.)

BEIJING ESTEK ELECTRONICS CO.,LTD

12 3 4 5 6 7

中文翻译

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与KA3844相关器件

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KA3844BDT&R	FAIRCHILD	获取价格	暂无描述
KA3844BDTF	FAIRCHILD	获取价格	暂无描述
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KA3845	ESTEK	获取价格	fixed frequency current mode PWM controller
KA3845B	FAIRCHILD	获取价格	SMPS Controller
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KA3845BDTF	FAIRCHILD	获取价格	暂无描述